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Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist

🗓️ 19 Aug 2026 11:56:28Reported by Python Packaging AdvisoryType 
pypa
 pypa🔗 github.com👁 4 Views

Lemur PUT authority endpoint allows non-admin to overwrite acme_url with internal IP, enabling SSRF bypassing allowlist.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
circl
Circl		CVE-2026-71303
18 Aug 202622:35
–circl
cve
CVE		CVE-2026-71303
18 Aug 202619:03
–cve
cvelist
Cvelist		CVE-2026-71303 Lemur: Incomplete fix for CVE-2026-55166 -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist
18 Aug 202619:03
–cvelist
euvd
EUVD		EUVD-2026-61154
18 Aug 202619:03
–euvd
github
Github Security Blog		Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist
18 Aug 202620:51
–github
nvd
NVD		CVE-2026-71303
18 Aug 202620:17
–nvd
osv
OSV		GHSA-V5RC-CPWC-CFPR Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist
18 Aug 202620:51
–osv
osv
OSV		PYSEC-2026-3679 Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist
19 Aug 202611:56
–osv
ptsecurity
Positive Technologies		PT-2026-77281
18 Aug 202600:00
–ptsecurity
vulnrichment
Vulnrichment		CVE-2026-71303 Lemur: Incomplete fix for CVE-2026-55166 -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist
18 Aug 202619:03
–vulnrichment
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pypilemurRange0–1.9.3

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19 Aug 2026 12:16Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.17.7
EPSS0.00211
SSVC
LemurSSRFIncomplete FixAuthority UpdateACME PluginAllowlist Bypass
4