CVE-2026-48747— Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| symfony | mailomat-mailer | >= 7.2.0, < 7.4.12 | affected |
>= 8.0.0-BETA1, < 8.0.13 | affected | ||
| symfony | symfony | >= 7.2.0, < 7.4.12 | affected |
>= 8.0.0-BETA1, < 8.0.13 | affected |
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I. Basic Information for CVE-2026-48747
Vulnerability Information
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Vulnerability Title
Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| symfony | symfony | >= 7.2.0, < 7.4.12 | - | |
| symfony | mailomat-mailer | >= 7.2.0, < 7.4.12 | - |
II. Public POCs for CVE-2026-48747
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Patches & Fixes for CVE-2026-48747 (2)
Vendor Advisories for CVE-2026-48747 (1)
Vendor Pages for CVE-2026-48747 (1)
Same Patch Batch · symfony · 2026-07-14 · 30 CVEs total
| CVE-2026-45133 | Symfony: [Yaml] Harden the parser when handling untrusted input | |
| CVE-2026-46644 | symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only | |
| CVE-2026-48761 | Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes on <object>, <applet>, | |
| CVE-2026-48736 | Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-c | |
| CVE-2026-48760 | Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks an | |
| CVE-2026-48489 | Symfony: Security Firewall Bypass via failure_forward Subrequest: Unauthenticated Access t | |
| CVE-2026-48784 | Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Gener | |
| CVE-2026-47212 | Symfony: Twilio Notifier Webhook Parser Never Verifies the X-Twilio-Signature HMAC: Unauth | |
| CVE-2026-45068 | Symfony: Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address | |
| CVE-2026-45071 | Symfony: XXE (Local File Disclosure) in DomCrawler::addXmlContent() via validateOnParse = | |
| CVE-2026-47767 | Symfony: SymfonyRuntime CVE-2024-50340 Patch Bypass: Web Requests Can Still Set APP_ENV/AP | |
| CVE-2026-45075 | Symfony: HEAD Request Bypasses methods: ['GET'] Filter in #[IsGranted] / #[IsSignatureVali | |
| CVE-2026-45304 | Symfony: YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansio | |
| CVE-2026-45063 | Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator | |
| CVE-2026-45070 | Symfony: Email Header Injection via Non-Token Characters in Mime Parameter Names | |
| CVE-2026-45756 | Symfony: JsonPath Evaluates Attacker-Controlled Regular Expressions in match()/search() Wi | |
| CVE-2026-45754 | Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthentica | |
| CVE-2026-45069 | Symfony: OidcTokenHandler Accepts JWTs Missing aud/iss/exp Claims | |
| CVE-2026-45753 | Symfony: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — javascr | |
| CVE-2026-45072 | Symfony: Stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File R |
Showing top 20 of 30 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: symfony
- CVE-2026-48761
Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attr - CVE-2026-48489
Symfony: Security Firewall Bypass via failure_forward Subreq - CVE-2026-48760
Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: - CVE-2026-48736
Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Form - CVE-2026-48784
Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other
Same vendor: symfony
- CVE-2026-46644
symfony/polyfill-intl-idn accepts xn-- labels whose Punycode - CVE-2026-48761
Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attr - CVE-2026-48489
Symfony: Security Firewall Bypass via failure_forward Subreq - CVE-2026-48760
Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: - CVE-2026-48736
Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Form
Same weakness: CWE-347
V. Comments for CVE-2026-48747
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