CVE-2026-48761: sensiolabs symfony Cross-site Scripting
Vulnerability summary
CVE-2026-48761 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in sensiolabs symfony. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.5% of scored vulnerabilities.
Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 21-07-2026Last modifiedVulnerability information updated.
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0 until 6.4.41, 7.4.13, and 8.0.13, UrlAttributeSanitizer::getSupportedAttributes() omitted URL-bearing attributes on <object>, <applet>, <iframe>, and <img>, and <meta http-equiv="refresh"> URLs inside content bypassed URL sanitization, allowing explicitly enabled elements or attributes to pass javascript: and similar payloads into sanitized output. This issue is fixed in versions 6.4.41, 7.4.13, and 8.0.13.
CVSS metrics
6 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- NVDNIST5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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 · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.34%
Chance of exploitation in the next 30 days
Percentile
27%
Versus all other CVEs
30-day change
0.00 pp
From 0.34% 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
- CWE-1023Incomplete Comparison with Missing FactorsThe product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.
Affected systems
Symfony2 products
- html-sanitizer≥ 6.1.0, < 6.4.41 | ≥ 7.0.0-BETA1, < 7.4.13 | ≥ 8.0.0-BETA1, < 8.0.13
- symfony≥ 6.1.0, < 6.4.41 | ≥ 7.0.0-BETA1, < 7.4.13 | ≥ 8.0.0-BETA1, < 8.0.13
Debian1 product
- symfony< 6.4.41+dfsg-0+deb13u1 | < 7.4.13+dfsg-1
Sensiolabs1 product
- symfony≥ 6.1.0, < 6.4.41 | ≥ 7.0.0, < 7.4.13 | ≥ 8.0.0, < 8.0.13
Ubuntu1 product
- symfonyAll versions (No fix recorded)
4 vendors · 5 products
References
9 links- github.com/symfony/symfony/security/advisories/GHSA-x5qj-865h-mgvmX Refsource CONFIRMPatchVendor Advisory
- github.com/symfony/symfony/commit/069a70f9f26e61e9de3b7f9a864a86ed24b36bd0X Refsource MISCREPORTPatch
- symfony.com/blog/…REPORT
