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CVE-2026-48747: Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

medium Affects symfony/mailomat-mailer, symfony/symfony. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

Package
symfony/mailomat-mailer Composer
Affected versions
>=7.2.0 and <7.4.13 or >=8.0.0 and <8.0.13 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.13
Fixed in
7.4.13, 8.0.13
Severity
medium
Exploitation
not on CISA KEV · EPSS 0% (16.0th percentile)
Published
2026-06-15
Source
osv.dev

References

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

Package
symfony/symfony Composer
Affected versions
>=7.2.0 and <7.4.13 or >=8.0.0 and <8.0.13 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.13
Fixed in
7.4.13, 8.0.13
Severity
medium
Exploitation
not on CISA KEV · EPSS 0% (16.0th percentile)
Published
2026-06-15
Source
osv.dev

References

CWE-347CWE-757
NVD recordsymfony/mailomat-mailer advisoriessymfony/symfony advisories

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