CVE-2026-25519: OpenSlides is a free, web based presentation and assembly system for managing and projecting agenda, motions a

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-25519 is a high-severity flaw (CVSS 8.1) affecting openslides. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenSlides is a free, web based presentation and assembly system for managing and projecting agenda, motions and elections of an assembly. Prior to version 4.2.29, OpenSlides supports local logins with username and password or an optionally configurable single sign on with SAML via an external IDP. For users synced to OpenSlides via an external IDP, there is an incorrect access control regarding the local login of these users. Users can successfu

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-02-04
Last modified	2026-06-17

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

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 21:16 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

openslides openslides UPGRADE

Affected: >= 4.2.5 and < 4.2.29

Fixed in: 4.2.29

Safe to downgrade to: a release before 4.2.5

1. Check installed version

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

2. UPGRADE to 4.2.29 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openslides

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 4.2.5 (Debian / Ubuntu)

apt-cache madison openslides sudo apt install openslides=<VERSION_BEFORE_4.2.5> sudo apt-mark hold openslides

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

dnf --showduplicates list openslides sudo dnf downgrade openslides-<VERSION_BEFORE_4.2.5> sudo dnf versionlock add openslides

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-2026-25519?

openslides: upgrade to 4.2.29. Exact commands for each OS are on this page.

Is CVE-2026-25519 being exploited?

CVE-2026-25519 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-2026-25519 affect?

CVE-2026-25519 affects openslides. Severity is high (CVSS 8.1). OpenSlides is a free, web based presentation and assembly system for managing and projecting agenda, motions and elections of an assembly. Prior to version 4.2.29, OpenSlides supports local logins with username and password or an optionally

How urgent is CVE-2026-25519?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-22893 HIGH 7.5 DOWNGRADE OpenSlides 4.0.15 verifies passwords by comparing password hashes using a function with content-dependent runt
CVE-2024-22892 HIGH 7.5 DOWNGRADE OpenSlides 4.0.15 was discovered to be using a weak hashing algorithm to store passwords.

References

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