Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, the Mailjet mailer bridge and LOX24 notifier bridge webhook parsers received configured webhook secrets but did not verify them, allowing unauthenticated POST requests to inject forged Mailjet and LOX24 event payloads. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
CVE-2026-45754
MEDIUMNVD 5.36.9▲Trending — 4 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 63% 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
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 6.9(medium)
- EPSS
- 36.9%
- KEV
- Not listed
Published
May 28, 2026
Last Modified
July 16, 2026
Advisory Details (6)
Auto-updated Jul 16, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
Mailjet Mailer and LOX24 Notifier Webhook Parsers Never Verify the Configured Secret: Unauthenticated Webhook Event Injection · Advisory · symfony/symfony · GitHub
https://github.com/symfony/symfony/security/advisories/GHSA-64hg-93w9-fc35github_release Patch Available
v8.0.12
Patch available: symfony/symfony v8.0.12
https://github.com/symfony/symfony/releases/tag/v8.0.12github_release Patch Available
v7.4.12
Patch available: symfony/symfony v7.4.12
https://github.com/symfony/symfony/releases/tag/v7.4.12github_release Patch Available
v6.4.40
Patch available: symfony/symfony v6.4.40
https://github.com/symfony/symfony/releases/tag/v6.4.40github_commit Patch Available
commit 4aaa45dd054f (symfony/symfony)
Patch available: symfony/symfony v7.4.12 (contains commit 4aaa45dd054f)
https://github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77github_commit Patch Available
commit 3e52bf5ab733 (symfony/symfony)
Patch available: symfony/symfony v6.4.40 (contains commit 3e52bf5ab733)
https://github.com/symfony/symfony/commit/3e52bf5ab733ee32e35eeeeb2631d859c941838eVendor Advisories for CVE-2026-45754(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(3 across 1 ecosystem)
Packagist(3)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| symfony/lox24-notifier | v8.0.0, v8.0.4 | 8.0.12 | — |
| symfony/mailjet-mailer | v8.0.0, v8.0.6, v8.0.7 | 8.0.12 | — |
| symfony/symfony | v8.0.0 ... v8.0.9 (12 versions) | 8.0.12 | — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× 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.
- 2026-07-16 04:26 UTCNVD updateCVSS v3 → 5.3
- 2026-07-16 02:52 UTCEG score recompute
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-14 19:03 UTCEG score recompute▲ 6.90
- 2026-07-14 19:00 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9
- 2026-06-15 22:13 UTCEG score recompute
- 2026-06-14 23:18 UTCEPSS rescore
- 2026-06-13 23:00 UTCEPSS rescore
- 2026-06-12 23:12 UTCEPSS rescore
- 2026-05-28 18:06 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-306 · CWE-287
Frequently asked(5)
What is CVE-2026-45754?
CVE-2026-45754 is a medium vulnerability published on May 28, 2026. Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, the Mailjet mailer bridge and LOX24 notifier bridge webhook parsers received configured webhook secrets but did not verify them, allowing unauthenticated POST…
When was CVE-2026-45754 disclosed?
CVE-2026-45754 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45754 actively exploited?
CVE-2026-45754 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45754?
CVE-2026-45754 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.9.
How do I remediate CVE-2026-45754?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45754, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45754
Is Your Infrastructure Affected by CVE-2026-45754?
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