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Github Security Blog
Github Security Blog
added 2026/05/18 9:31 a.m.22 views

Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint

Mattermost versions 11.5.x = 11.5.1, 11.4.x = 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows an authenticated channel member to force the reveal of a burn-on-read message without recipient consent via a crafted Markdown image tag.. Mattermost...

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0References4Affected Software2
OSV
OSV
added 2026/05/18 9:31 a.m.33 views

GHSA-XVCX-MGPC-5XH3 Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint

Mattermost versions 11.5.x = 11.5.1, 11.4.x = 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows an authenticated channel member to force the reveal of a burn-on-read message without recipient consent via a crafted Markdown image tag.. Mattermost...

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0References4
NVD
NVD
added 2026/05/18 9:16 a.m.50 views

CVE-2026-6339

Mattermost versions 11.5.x = 11.5.1, 11.4.x = 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows an authenticated channel member to force the reveal of a burn-on-read message without recipient consent via a crafted Markdown image tag.. Mattermost...

4.3CVSS0.00113EPSS
SaveExploits0References1
Vulnrichment
Vulnrichment
added 2026/05/18 8:05 a.m.9 views

CVE-2026-6339 Missing request origin validation on burn-on-read reveal endpoint

Mattermost versions 11.5.x = 11.5.1, 11.4.x = 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows an authenticated channel member to force the reveal of a burn-on-read message without recipient consent via a crafted Markdown image tag.. Mattermost...

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0References1
CVE
CVE
added 2026/05/18 8:05 a.m.44 views

CVE-2026-6339

Mattermost contains a vulnerability (CVE-2026-6339) in versions 11.5.x <= 11.5.1 and 11.4.x

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0References1Affected Software1
CNNVD
CNNVD
added 2026/05/18 12:00 a.m.16 views

Mattermost 访问控制错误漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Versions of Mattermost such as 11.5.1 and earlier 11.5.x series, as well as 11.4.3 and earlier 11.4.x series, have a access control vulnerability. This vulnerability stems from the failure to validat...

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0References1
Positive Technologies
Positive Technologies
added 2026/05/18 12:00 a.m.23 views

PT-2026-41657

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.4.x through 11.4.3 Mattermost versions 11.5.x through 11.5.1 Description An issue exists where the burn-on-read reveal endpoint fails to validate the 'X-Requested-With' header. This allows an authenticated channel member...

4.3CVSS5.8AI score0.00113EPSS
SaveExploits0
Fedora
Fedora
added 2026/05/17 1:27 a.m.26 views

[SECURITY] Fedora 44 Update: python-jupytext-1.19.1-4.fc44

Have you always wished Jupyter notebooks were plain text documents? Wished you could edit them in your favorite IDE? And get clear and meaningful diffs when doing version control? Then... Jupytext may well be the tool you're looking for! Jupytext is a plugin for Jupyter that can save Jupyter...

9.8CVSS6.5AI score0.02759EPSS
SaveExploits2
Fedora
Fedora
added 2026/05/17 1:05 a.m.21 views

[SECURITY] Fedora 42 Update: python-jupytext-1.19.1-4.fc42

Have you always wished Jupyter notebooks were plain text documents? Wished you could edit them in your favorite IDE? And get clear and meaningful diffs when doing version control? Then... Jupytext may well be the tool you're looking for! Jupytext is a plugin for Jupyter that can save Jupyter...

9.8CVSS6.5AI score0.02759EPSS
SaveExploits2
Fedora
Fedora
added 2026/05/17 12:50 a.m.26 views

[SECURITY] Fedora 43 Update: python-jupytext-1.19.1-4.fc43

Have you always wished Jupyter notebooks were plain text documents? Wished you could edit them in your favorite IDE? And get clear and meaningful diffs when doing version control? Then... Jupytext may well be the tool you're looking for! Jupytext is a plugin for Jupyter that can save Jupyter...

9.8CVSS6.5AI score0.02759EPSS
SaveExploits2
Veracode
Veracode
added 2026/05/16 5:25 a.m.16 views

Out-of-bounds Read

github.com/gomarkdown/markdown is vulnerable to an Out-of-Bounds Read. The vulnerability is due to improper handling of malformed Markdown input containing a character when processed by the SmartypantsRenderer, which allows an attacker to trigger an out-of-bounds read or cause the application to...

7.5CVSS5.9AI score0.00346EPSS
SaveExploits1References2Affected Software1
OSV
OSV
added 2026/05/15 9:31 p.m.18 views

GHSA-J76W-P754-G2W7 Mattermost doesn't validate the response body of proxied images

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to validate the response body of proxied images, which allows a remote attacker to enact client-side DoS via an SVG file served from an attacker-controlled origin under a non-SVG Content-Type header e.g. image/png...

4.3CVSS5.8AI score0.00242EPSS
SaveExploits0References3
Snyk
Snyk
added 2026/05/15 9:29 p.m.9 views

Improper Check for Unusual or Exceptional Conditions

Overview Affected versions of this package are vulnerable to Improper Check for Unusual or Exceptional Conditions via the image proxy process. An attacker can cause a denial of service on client systems by serving malicious SVG files from an attacker-controlled origin with a misleading Content-Ty...

6.5CVSS5.8AI score0.00242EPSS
SaveExploits0References2
NVD
NVD
added 2026/05/15 7:16 p.m.15 views

CVE-2021-47963

Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands...

7.2CVSS0.00469EPSS
SaveExploits0References3
Vulnrichment
Vulnrichment
added 2026/05/15 6:36 p.m.14 views

CVE-2021-47963 Anote 1.0 Persistent Cross-Site Scripting Remote Code Execution

Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands...

7.2CVSS6.5AI score0.00469EPSS
SaveExploits0References3
Cvelist
Cvelist
added 2026/05/15 6:36 p.m.56 views

CVE-2021-47963 Anote 1.0 Persistent Cross-Site Scripting Leading to Code Execution

Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands...

7.2CVSS0.00469EPSS
SaveExploits0References3
EUVD
EUVD
added 2026/05/15 6:36 p.m.15 views

EUVD-2021-34816

Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands...

7.2CVSS6.5AI score0.00469EPSS
SaveExploits0References3
ATTACKERKB
ATTACKERKB
added 2026/05/15 6:36 p.m.9 views

CVE-2021-47963

Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands...

7.2CVSS6.5AI score0.00469EPSS
SaveExploits0References3Affected Software1
CVE
CVE
added 2026/05/15 6:36 p.m.27 views

CVE-2021-47963

CVE-2021-47963 affects Anote 1.0 and describes a persistent cross-site scripting vulnerability in which attackers can inject malicious payloads into markdown files stored by the application. When a crafted markdown file containing embedded JavaScript is opened, it can execute system commands on t...

7.2CVSS6.5AI score0.00469EPSS
SaveExploits0References3
CVE
CVE
added 2026/05/15 6:32 p.m.32 views

CVE-2026-4054

Mattermost disclosure CVE-2026-4054 affects Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, and 11.4.x

6.5CVSS5.8AI score0.00242EPSS
SaveExploits0References1Affected Software1
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