CVE-2026-25642: HedgeDoc is an open source, real-time, collaborative, markdown notes application

Q: How do I fix CVE-2026-25642?

hedgedoc: upgrade to 1.10.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-25642 being exploited?

CVE-2026-25642 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-2026-25642 affect?

CVE-2026-25642 affects hedgedoc. Severity is medium (CVSS 4.3). HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.6, files served below the /uploads/ endpoint did not use a more strict security-policy. This resulted in a too open Content-Security-Policy and

Q: How urgent is CVE-2026-25642?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-25642 is a medium-severity flaw (CVSS 4.3) affecting hedgedoc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.6, files served below the /uploads/ endpoint did not use a more strict security-policy. This resulted in a too open Content-Security-Policy and furthermore opened the possibility to host malicious interactive web content (such as fake login forms) using SVG files. This vulnerability is fixed in 1.10.6.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hedgedoc

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

Am I affected?

Timeline

2026-02-06 20:16 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

hedgedoc hedgedoc UPGRADE

Affected: < 1.10.6

Fixed in: 1.10.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.10.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hedgedoc

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-2026-25642?

hedgedoc: upgrade to 1.10.6. Exact commands for each OS are on this page.

Is CVE-2026-25642 being exploited?

CVE-2026-25642 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-2026-25642 affect?

CVE-2026-25642 affects hedgedoc. Severity is medium (CVSS 4.3). HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.6, files served below the /uploads/ endpoint did not use a more strict security-policy. This resulted in a too open Content-Security-Policy and

How urgent is CVE-2026-25642?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2025-66629 LOW 3.7 UPGRADE HedgeDoc is an open source, real-time, collaborative, markdown notes application
CVE-2025-32391 MEDIUM 6.4 UPGRADE HedgeDoc is an open source, real-time, collaborative, markdown notes application
CVE-2024-45308 MEDIUM 6.5 UPGRADE HedgeDoc is an open source, real-time, collaborative, markdown notes application

References

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