CVE-2026-1554: XML Injection (aka Blind XPath Injection) vulnerability in Drupal Central Authentication System (CAS) Server a

Routine

MEDIUM 4.2UPGRADE

CVE-2026-1554 is a medium-severity flaw (CVSS 4.2) affecting central authentication system server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XML Injection (aka Blind XPath Injection) vulnerability in Drupal Central Authentication System (CAS) Server allows Privilege Escalation.This issue affects Central Authentication System (CAS) Server: from 0.0.0 before 2.0.3, from 2.1.0 before 2.1.2.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-91
Published	2026-02-04
Last modified	2026-06-17

Publisher (CNA): Drupal.org · Vendor: jtenman

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-04 21:15 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

jtenman central authentication system server UPGRADE

Affected: < 2.0.3 · >= 2.1.0 and < 2.1.2

Fixed in: 2.0.3, 2.1.2

Safe to downgrade to: a release before 2.1.0

1. Check installed version

apt-cache policy central-authentication-system-server || rpm -q central-authentication-system-server || central-authentication-system-server --version

2. UPGRADE to 2.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade central-authentication-system-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade central-authentication-system-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison central-authentication-system-server sudo apt install central-authentication-system-server=<VERSION_BEFORE_2.1.0> sudo apt-mark hold central-authentication-system-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list central-authentication-system-server sudo dnf downgrade central-authentication-system-server-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add central-authentication-system-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1554?

central authentication system server: upgrade to 2.0.3, 2.1.2. Exact commands for each OS are on this page.

Is CVE-2026-1554 being exploited?

CVE-2026-1554 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1554 affect?

CVE-2026-1554 affects central authentication system server. Severity is medium (CVSS 4.2). XML Injection (aka Blind XPath Injection) vulnerability in Drupal Central Authentication System (CAS) Server allows Privilege Escalation.This issue affects Central Authentication System (CAS) Server: from 0.0.0 before 2.0.3, from 2.1.0 befo

How urgent is CVE-2026-1554?

Priority 16/100. No elevated risk signals yet.

Software pages

Drupal vulnerabilities

References

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