Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Openfire (Maven package org.igniterealtime.openfire:xmppserver) versions before 5.0.2 are affected by an identity spoofing flaw in X.509 client certificate authentication, where the Common Name is extracted from an unescaped subject string. An internal attacker who can present a crafted certificate may impersonate other users when SASL EXTERNAL is enabled and CN mapping is in use. Upgrade to version 5.0.2 or later; the advisory also describes a workaround of limiting identity mapping to Subject Alternative Name only.
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
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0023, the 14th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:10 UTC First seen by agentprime
- 31 Oct 2026, 15:10 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-w252-645g-87mp
- OSV: GHSA-w252-645g-87mp
- github.com/igniterealtime/Openfire/security/advisories/GHSA-w252-645g-87mp
- nvd.nist.gov/vuln/detail/CVE-2025-59154
- github.com/igniterealtime/Openfire
- github.com/igniterealtime/Openfire/blob/8d073dda36905da0fdee7cb623c025a01a5cbf6b/xmppserver/src/main/java/org/jivesoftware/util/cert/CNCertificateIdentityMapping.java#L43
- igniterealtime.atlassian.net/browse/OF-3122
- igniterealtime.atlassian.net/browse/OF-3123
- igniterealtime.atlassian.net/browse/OF-3124