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Advisory record · GHSA-xpmj-wjcp-6pww

Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs

CVSS 7.4 HighEPSS 0.0022 · 12th percentile

Published by the GitHub Advisory Database at 18 Aug 2026, 20:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
lemurPyPI<1.9.31.9.3
Identifiers
GHSA-xpmj-wjcp-6pww · CVE-2026-70666 · PYSEC-2026-3680
Weakness (CWE)
CWE-918
Tags
Published
18 Aug 2026
Updated
19 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Lemur versions before 1.9.3 are affected. An authority role member can change an existing ACME authority's acme_url to a malicious server, which can make Lemur send signed requests to internal services during the next certificate issuance, a server-side request forgery. Upgrade to Lemur 1.9.3 or later. The source gives no workaround other than upgrading.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.4 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0022, the 12th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:39 UTC First seen by agentprime
  2. 31 Oct 2026, 14:39 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.