CVE-2026-48747: sensiolabs symfony
Vulnerability summary
CVE-2026-48747 is a medium (CVSS 6.3) vulnerability in sensiolabs symfony. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.
Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.3MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- NVDNIST6.3MediumCVSS:4.0/AV:N/AC:H/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
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
15%
Versus all other CVEs
30-day change
0.00 pp
From 0.25% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-347Improper Verification of Cryptographic SignatureThe product does not verify, or incorrectly verifies, the cryptographic signature for data.
- CWE-757Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
Affected systems
Symfony2 products
- mailomat-mailer≥ 7.2.0, < 7.4.12 | ≥ 8.0.0-BETA1, < 8.0.13
- symfony≥ 7.2.0, < 7.4.12 | ≥ 8.0.0-BETA1, < 8.0.13
Debian1 product
- symfony< 7.4.13+dfsg-1
Sensiolabs1 product
- symfony≥ 7.2.0, < 7.4.13 | ≥ 8.0.0, < 8.0.13
Ubuntu1 product
- symfonyAll versions (No fix recorded)
4 vendors · 5 products
References
8 links- github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvrX Refsource CONFIRMPatchVendor Advisory
- github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88X Refsource MISCREPORTPatch
- symfony.com/blog/…REPORT
