CVE-2023-34252

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 2.1% (80th percentile of EPSS-scored CVEs). 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, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.1%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Grav is a flat-file content management system. Prior to version 1.7.42, there is a logic flaw in the GravExtension.filterFilter() function whereby validation against a denylist of unsafe functions is only performed when the argument passed to filter is a string. However, passing an array as a callable argument allows the validation check to be skipped. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. The vulnerability can be found in the GravExtension.filterFilter() function declared in /system/src/Grav/Common/Twig/Extension/GravExtension.php. Version 1.7.42 contains a patch for this issue. End users should also ensure that twig.undefined_functions and twig.undefined_filters properties in /path/to/webroot/system/config/system.yaml configuration file are set to false to disallow Twig from treating undefined filters/functions as PHP functions and executing them.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
71
EG Risk 71/100CISA SSVC

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
Severity88% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.1%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 14, 2023

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit, github.
githubMentions a patch (unverified)

Grav Server-side Template Injection (SSTI) via Insufficient Validation in filterFilter · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-96xv-rmwj-6p9w
github_commit Patch Available

commit 244758d43830 (getgrav/grav)

Patch available: getgrav/grav 2.0.0-beta.4 (contains commit 244758d43830)

https://github.com/getgrav/grav/commit/244758d4383034fe4cd292d41e477177870b65ec
generic

grav/system/src/Grav/Common/Utils.php at 1.7.40 · getgrav/grav · GitHub

https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1956-L2074
generic

grav/system/src/Grav/Common/Twig/Extension/GravExtension.php at 1.7.40 · getgrav/grav · GitHub

https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Twig/Extension/GravExtension.php#L1692-L1698

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
getgrav/grav0.8.0 ... 1.7.9 (269 versions)
  • every version up to 1.7.42: fixed in 1.7.42
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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.

Showing the most recent 100 of 189 total refreshes for this CVE.

  1. 2026-10-09 20:05 UTCEPSS rescore
  2. 2026-10-08 17:06 UTCEPSS rescore
  3. 2026-10-07 23:46 UTCEPSS rescore
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  8. 2026-09-30 16:24 UTCEG score recompute
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  1. 2026-09-08 21:57 UTCEPSS rescore
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  53. 2026-07-23 02:23 UTCEG score recompute
  54. 2026-07-22 23:10 UTCEG score recompute
  55. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-34252?
CVE-2023-34252 is a high vulnerability published on June 14, 2023. Grav is a flat-file content management system. Prior to version 1.7.42, there is a logic flaw in the GravExtension.filterFilter() function whereby validation against a denylist of unsafe functions is only performed when the argument passed to filter is a string. However, passing an array as a…
When was CVE-2023-34252 disclosed?
CVE-2023-34252 was first published on June 14, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-34252 actively exploited?
CVE-2023-34252 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.1% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-34252?
CVE-2023-34252 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-34252?
A fix for CVE-2023-34252 is available: update to the fixed version the vendor names in its advisory.

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