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CVE-2026-45754· NVD / CVE Program· CNA GitHub_M

Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection

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.

MediumCVSS 6.9 · v4.0—No exploit Fix available
Published
Jul 14, 2026
Updated
Jul 21, 2026
EPSS
0.4% · 36th percentile
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Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
sensiolabssymfony

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • sensiolabs symfony6.4.0 and later · before 6.4.40
  • sensiolabs symfony7.0.0 and later · before 7.4.12
  • sensiolabs symfony8.0.0 and later · before 8.0.12

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • symfony lox24-notifier

    • >= 7.1.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12affected

  • symfony mailjet-mailer

    • >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12affected

  • symfony symfony

    • >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13symfonybefore 6.4.41+dfsg-0+deb13u16.4.41+dfsg-0+deb13u1
Debian:14symfonybefore 7.4.12+dfsg-17.4.12+dfsg-1
Packagistsymfony/lox24-notifierfrom 7.1.0 · before 7.4.127.4.12
Packagistsymfony/lox24-notifierfrom 8.0.0 · before 8.0.128.0.12
Packagistsymfony/mailjet-mailerfrom 6.4.0 · before 6.4.406.4.40
Packagistsymfony/mailjet-mailerfrom 7.0.0 · before 7.4.127.4.12
Packagistsymfony/mailjet-mailerfrom 8.0.0 · before 8.0.128.0.12
Packagistsymfony/symfonyfrom 6.4.0 · before 6.4.406.4.40
Packagistsymfony/symfonyfrom 7.0.0 · before 7.4.127.4.12
Packagistsymfony/symfonyfrom 8.0.0 · before 8.0.128.0.12

Same product

sensiolabs: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-18889An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7.
    49Plan
  • CVE-2018-14773An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48, 2.8.0 through 2.8.43, 3.3.0 through 3.3.17, 3.4.0 through 3.4.13
    43Plan
  • CVE-2019-10910In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, when service ids allow user inp
    41Plan
  • CVE-2019-11325An issue was discovered in Symfony before 4.2.12 and 4.3.x before 4.3.8.
    40Plan
  • CVE-2017-11365Certain Symfony products are affected by: Incorrect Access Control.
    40Plan
  • CVE-2019-10913In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, HTTP Methods provided as verbs
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:symfony6.4.41+dfsg-0+deb13u1 · Debian:13Package registry (OSV)
Packagist:symfony/lox24-notifier7.4.12Package registry (OSV)
Packagist:symfony/lox24-notifier8.0.12Package registry (OSV)
Packagist:symfony/mailjet-mailer6.4.40Package registry (OSV)
Packagist:symfony/mailjet-mailer7.4.12Package registry (OSV)
Packagist:symfony/mailjet-mailer8.0.12Package registry (OSV)
Packagist:symfony/symfony6.4.40Package registry (OSV)
Packagist:symfony/symfony7.4.12Package registry (OSV)
Packagist:symfony/symfony8.0.12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records