CVE-2026-25101: Bludit allows user's session identifier to be set before authentication

Q: How do I fix CVE-2026-25101?

bludit: upgrade to 3.17.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-25101 being exploited?

CVE-2026-25101 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-2026-25101 affect?

CVE-2026-25101 affects bludit. Severity is critical (CVSS 9.8). Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behavior enables an attacker to fix a session ID for a victim and later hijack the authenticated

Q: How urgent is CVE-2026-25101?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-25101 is a critical-severity flaw (CVSS 9.8) affecting bludit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behavior enables an attacker to fix a session ID for a victim and later hijack the authenticated session. This issue was fixed in version 3.17.2.

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	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-384
Published	2026-03-27
Last modified	2026-06-17

Publisher (CNA): CERT.PL · Vendor: bludit

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

Am I affected?

Timeline

2026-03-27 12:16 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

bludit bludit UPGRADE

Affected: < 3.17.2

Fixed in: 3.17.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.17.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bludit

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-2026-25101?

bludit: upgrade to 3.17.2. Exact commands for each OS are on this page.

Is CVE-2026-25101 being exploited?

CVE-2026-25101 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-2026-25101 affect?

CVE-2026-25101 affects bludit. Severity is critical (CVSS 9.8). Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behavior enables an attacker to fix a session ID for a victim and later hijack the authenticated

How urgent is CVE-2026-25101?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-4420 MEDIUM 5.4 DOWNGRADE Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its page creating functionality
CVE-2026-25100 MEDIUM 5.4 UPGRADE Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its image upload functionality
CVE-2026-25099 HIGH 8.8 UPGRADE Bludit’s API plugin allows an authenticated attacker with a valid API token to upload files of any type and ex

References

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