Which products and versions are affected by CVE-2026-77806?

Affected: SPIP. The full list is in the CVE brief.

Is CVE-2026-77806 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 21, 2026.

Is CVE-2026-77806 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-77806?

No public exploit code is known.

Is there a fix for CVE-2026-77806?

Fixed versions are available, including SPIP 4.4.21+dfsg-0+deb13u1, SPIP 4.4.21+dfsg-1, SPIP 4.4.21.

How urgently should CVE-2026-77806 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2026-77806

CriticalExploited

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026.

Published Aug 21, 2026 · Updated Oct 15, 2026 · Also known as UBUNTU-CVE-2026-77806

Key Facts

Patch immediately

CVE-2026-77806 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting SPIP.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 21, 2026. No public exploit code is known.
EPSS estimates a 4.5% probability of exploitation in the next 30 days.
Fixed versions are available, including SPIP 4.4.21+dfsg-0+deb13u1, SPIP 4.4.21+dfsg-1, SPIP 4.4.21.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

4.5%

Higher than 91.3% of all scored CVEs

Exploited in the wild

Yes

2 catalog listings

Public exploit code

None known

Get the full CVE-2026-77806 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Aug 21, 2026	n/a	Not reported
CIRCL KEV	Aug 21, 2026	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

13 affected entries in total

Product	Affected versions	Fixed in
SPIPSpip	See advisory	4.4.21

Patched Releases

SPIP

4.4.21+dfsg-0+deb13u1, 4.4.21+dfsg-1, 4.4.21

Timeline

Publicly disclosed
Aug 21, 2026
Added to Industry KEV feed
Aug 21, 2026
Added to CIRCL KEV
Aug 21, 2026
Last updated
Oct 15, 2026

Weakness Type

CWE-94 Improper Control of Generation of Code ('Code Injection')

References

2 more references in the full CVE brief

FAQ

Common Questions.

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026.
Affected: SPIP. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 21, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including SPIP 4.4.21+dfsg-0+deb13u1, SPIP 4.4.21+dfsg-1, SPIP 4.4.21.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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