CVE-2026-77136

CRITICALPre-NVD 9.59.5—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 56% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The extension passes the raw value of a form field configured as "This field contains the name of the sender" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild.

CVSS v3
9.5
EG Score
9.5(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity95% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

TYPO3-EXT-SA-2026-022: Server-Side Template Injection (SSTI) in extension "powermail" (powermail) - TYPO3 News

https://typo3.org/security/advisory/typo3-ext-sa-2026-022

Vendor Advisories for CVE-2026-77136(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 13× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-26 05:51 UTCGHSA enrichment
  2. 2026-08-26 01:57 UTCGHSA enrichment
  3. 2026-08-25 22:05 UTCGHSA enrichment
  4. 2026-08-25 18:13 UTCGHSA enrichment
  5. 2026-08-25 14:21 UTCEG score recompute
  6. 2026-08-25 14:21 UTCGHSA enrichment
  7. 2026-08-25 14:15 UTCEG score recompute
  8. 2026-08-25 14:15 UTCGHSA enrichment
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-25 13:14 UTCGHSA enrichment
  11. 2026-08-25 09:22 UTCEG score recompute
  12. 2026-08-25 09:07 UTCEG score recompute
  13. 2026-08-25 09:06 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77136?
CVE-2026-77136 is a critical vulnerability published on August 25, 2026. The extension passes the raw value of a form field configured as "This field contains the name of the sender" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute…
When was CVE-2026-77136 disclosed?
CVE-2026-77136 was first published in the National Vulnerability Database on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77136 actively exploited?
CVE-2026-77136 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.2% of all scored CVEs.
What is the CVSS score of CVE-2026-77136?
CVE-2026-77136 has a CVSS v3 base score of 9.5 (NVD).
How do I remediate CVE-2026-77136?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77136, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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