How serious is CVE-2026-3099?

This vulnerability has a CVSS score of 5.8 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-3099?

Yes, proof-of-concept exploit code for CVE-2026-3099 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-3099?

Check the official CVE details for a complete list of affected products and versions.

How do I fix CVE-2026-3099?

To remediate CVE-2026-3099, check for security patches from the vendor. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-3099

Medium

|5.8

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

An attacker can repeatedly use a captured authentication header to bypass login protections and gain unauthorized access to restricted areas of a system. This vulnerability occurs because the server does not properly track or enforce unique authentication tokens, allowing the same token to be reused.

Technical Description

A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

Confidentiality ImpactLow

Integrity ImpactLow

Availability ImpactLow

ScopeChanged

Vector String

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L

Exploit Resources

Search for proof-of-concept code and exploit modules

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Official References

NIST NVD

Est. Bounty

$810($500-$1K)

Vendor Response

Grade APatched in 0 days

Quick Information

Published

Mar 12, 2026

26 days ago

Last Modified

Mar 12, 2026

26 days ago