PT-2026-98161

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.1.8 Discourse versions prior to 2026.6.3 Discourse versions prior to 2026.7.2 Discourse versions prior to 2026.8.0 Description Sites using wildcard patterns in the allowed iframes setting may accept a crafted...

CVE-2026-91121: Improper Neutralization of Input During Web Page Generation

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, attacker-controlled upload filenames used in chat message excerpts were rendered as unescaped HTML. A user able to upload a file and send chat content could place markup in a filename that was th...

CVE-2026-91134: Improper Input Validation

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowediframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form...

PT-2026-98154

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.1.8 Discourse versions prior to 2026.6.3 Discourse versions prior to 2026.7.2 Discourse versions prior to 2026.8.0 Description The post sanitizer allows a stored cross-origin iframe to bypass the allowed iframe...

PT-2026-98204

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.1.8 Discourse versions prior to 2026.6.3 Discourse versions prior to 2026.7.2 Discourse versions prior to 2026.8.0 Description Attacker-controlled upload filenames used in chat message excerpts are rendered as...

CVE-2026-91119: Improper Neutralization of Input During Web Page Generation

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the topic small-action and nested-activity-log components interpolated the free-form actioncodewho value into mention-link href attributes without URL encoding. A quote-bearing display name could...

PT-2026-98202

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.1.8 Discourse versions prior to 2026.6.3 Discourse versions prior to 2026.7.2 Discourse versions prior to 2026.8.0 Description The topic small-action and nested-activity-log components interpolate the free-form...

CVE-2026-84302: Missing Authorization

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did n...

PT-2026-98146

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.1.6 Discourse versions prior to 2026.5.2 Discourse versions prior to 2026.6.1 Discourse versions prior to 2026.7.0 Description AI reviewables associated with private messages may appear in the moderator review...

CVE-2026-91122: Improper Neutralization of Input During Web Page Generation

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the video placeholder component allowed crafted HTML to cause an attribute breakout and inject an attacker-controlled event handler. An authenticated user with default trust-level posting...

Researchers used Claude to hack OpenAI

We’ve heard of OpenAI’s AI agents running amok and hacking other companies. Now, a cybersecurity company has turned the tables on the ChatGPT operator by using AI to help hack OpenAI itself. The hack, which also exposed a bug affecting dozens of other major online services, was conducted as...

CVE-2026-59830

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

CVE-2026-59830 Discourse: Stored XSS via unescaped actor name in post actions

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

EUVD-2026-84181

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

CVE-2026-59830 Discourse: Stored XSS via unescaped actor name in post actions

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

CVE-2026-59830

Discourse , an open-source discussion platform, is affected by a stored XSS in the post action component prior to version 2026.7.0 . The root cause is that user-controlled display names are not escaped before being interpolated into an HTML string passed to trustHTML, allowing an attacker who cra...

CVE-2026-59830 Discourse: Stored XSS via unescaped actor name in post actions

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

PT-2026-96282

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.7.0 Description The post action component fails to escape user-controlled display names before they are interpolated into an HTML string passed to the trustHTML function. An attacker can set a crafted display...

CVE-2026-59830: Improper Neutralization of Input During Web Page Generation

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action...

Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws

Three researchers at the security firm Hacktron used Anthropic's Claude Opus 5 to chain two flaws and take over the ChatGPT and Codex accounts of several OpenAI employees, then reach an internal OpenAI code repository. The chain began with a bug in the software that runs OpenAI's public help foru...