GHSA-8q72-6qq8-xv64: apereo/phpcas (CVE-2022-39369)

Package	Ecosystem	Affected	Fixed in
apereo/phpcas	Packagist	<1.6.0	1.6.0

Machine-written summary

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

Packagist apereo/phpcas versions before 1.6.0 use HTTP headers such as Host to determine the service URL used to validate CAS tickets. An attacker who controls these headers and holds a valid ticket for another authorized service on the same CAS server can authenticate to a phpCAS-protected service as a victim who is logged in, if the victim visits the attacker's site. Upgrade to apereo/phpcas 1.6.0 or later, which requires an explicit service base URL. Setting the full current page URL with setUrl() or sanitizing the affected headers at a reverse proxy also avoids the issue.

Written 4 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

Score	Rating	CVSS	Vector	Source
8.0	High	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.024, the 84th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:30 UTC First seen by agentprime
31 Oct 2026, 14:30 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.