CVE-2025-56422: A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitr

Q: How do I fix CVE-2025-56422?

limesurvey: upgrade to newer than 6.14.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-56422 being exploited?

CVE-2025-56422 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-56422 affect?

CVE-2025-56422 affects limesurvey. Severity is critical (CVSS 9.8). A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitrary code on the server.

Q: How urgent is CVE-2025-56422?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-56422 is a critical-severity flaw (CVSS 9.8) affecting limesurvey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitrary code on the server.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-03-10
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: limesurvey

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-10 18:17 UTCPublished CVE record published
2026-07-05 02:17 UTCUpdated Record last modified

limesurvey limesurvey UPGRADE

Affected: <= 6.14.3

Fixed in: newer than 6.14.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy limesurvey || rpm -q limesurvey || limesurvey --version

2. UPGRADE to newer than 6.14.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade limesurvey

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade limesurvey

Note

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

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-2025-56422?

limesurvey: upgrade to newer than 6.14.3. Exact commands for each OS are on this page.

Is CVE-2025-56422 being exploited?

CVE-2025-56422 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-2025-56422 affect?

CVE-2025-56422 affects limesurvey. Severity is critical (CVSS 9.8). A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitrary code on the server.

How urgent is CVE-2025-56422?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-70797 MEDIUM 6.1 DOWNGRADE Cross Site Scripting vulnerability in Limesurvey v.6.15.20+251021 allows a remote attacker to execute arbitrar
CVE-2025-63238 MEDIUM 6.1 UPGRADE A Reflected Cross-Site Scripting (XSS) affects LimeSurvey versions prior to 6.15.11+250909, due to the lack of
CVE-2025-56421 HIGH 7.5 UPGRADE SQL Injection vulnerability in LimeSurvey before v.6.15.4+250710 allows a remote attacker to obtain sensitive

References

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