CVE-2025-55797: An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/[schemaId] endpoint all

Routine

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-55797 is a medium-severity flaw (CVSS 6.5) affecting formcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/[schemaId] endpoint allows unauthenticated attackers to access historical schema data if a valid schemaId is known or guessed.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-09-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: formcms

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

Am I affected?

Timeline

2025-09-30 16:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

formcms formcms DOWNGRADE

Affected: 0.5.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.5.4 (Debian / Ubuntu)

apt-cache madison formcms sudo apt install formcms=<VERSION_BEFORE_0.5.4> sudo apt-mark hold formcms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list formcms sudo dnf downgrade formcms-<VERSION_BEFORE_0.5.4> sudo dnf versionlock add formcms

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-2025-55797?

formcms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-55797 being exploited?

CVE-2025-55797 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-2025-55797 affect?

CVE-2025-55797 affects formcms. Severity is medium (CVSS 6.5). An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/[schemaId] endpoint allows unauthenticated attackers to access historical schema data if a valid schemaId is known or guessed.

How urgent is CVE-2025-55797?

Priority 34/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-56236 MEDIUM 6.1 UPGRADE FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature

References

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