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Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-77806

SPIP

SPIP / SPIP · affected before 4.4.21

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Severity
CVSS 9.8 · Critical
Confidence
High
Exploit status
Exploited in the wild
EPSS
0.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-77806 is an unauthenticated vulnerability affecting SPIP SPIP. 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...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high.

Who is affected?

SPIP / SPIP affected before 4.4.21.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

SPIP

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.

Vendor Product Affected Status
SPIP SPIP Before 4.4.21 Affected
Published
21 Aug 2026
Exploitation Reported
21 Aug 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 21 Aug 2026

Independent exploitation attestation added to the Previdian record.

Proof of concept available

GitHub

Recorded 24 Aug 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CVE First 2026-08-21 13:50 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

0.8%

Weaknesses

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

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CuteeCat/CVE-2026-77806

github · Created 2026-08-24 22:22:05 UTC · 0 stars · AI assessment 85%

CVE-2026-77806漏洞检测代码

Timeline

From disclosure to observed exploitation

  1. Public PoC available

    Public proof-of-concept code published

  2. Added to the Previdian watchlist

    Added to the Previdian curated list for closer monitoring

  3. Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-77806

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-77806",
  "confidence": "High",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.00784,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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