CVE-2026-48747Disclosure(sensiolabs / symfony)

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.

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0.0/ 10 priority

Sources & remediation

Patch / fix

Other references

Weakness type (CWE)

CWE-347CWE-757

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

symfony

Threat summary

2 mentions across 2 observed days
Momentum state: stable

What's happening

Technical details provided in 1 signal
Disclosure: 2 classified signals
Peaked 1d ago at 1 mentions (2026-05-27); latest day: 1
2 total mentions across 2 days

Affected systems

Vendors

sensiolabs

Products

symfony

Deep dive

Activity timeline2 mentions / 2d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Essam Alanazi@xxpw666137d
Disclosure
Found a vulnerability and got a CVE assigned (CVE-2026-48747) The flaw is a Signature Algorithm Downgrade in the mailomat-mailer component, allowing an attacker to achieve complete Signature Forgery. https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr #CVE #Symfony #AppSec #BugBounty
Post summary
A new CVE-2026-48747 has been disclosed, detailing a Signature Algorithm Downgrade flaw in the mailomat-mailer component that enables full signature forgery, with a link to the official GitHub security advisory.
2201121.0K
108 followersView on X
DailyCVE@dailycve118d
Disclosure
🟠 Symfony Mailer Mailomat Bridge, Algorithm Confusion, #CVE-2026-48747 (Medium) -DC-Jun2026-420 https://dailycve.com/symfony-mailer-mailomat-bridge-algorithm-confusion-cve-2026-48747-medium-dc-jun2026-420/
Post summary
A new medium‑severity CVE (CVE‑2026‑48747) impacting Symfony Mailer Mailomat Bridge was published, noting an algorithm confusion vulnerability, but the post lacks detailed technical or exploit information.
0000028
212 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	sensiolabs	symfony	-	-	-

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