CVE-2026-48761: Symfony is a PHP framework for web and console applications and a set of reusable PHP components

Q: How urgent is CVE-2026-48761?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-48761 is a medium-severity flaw (CVSS 6.1) affecting symfony. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 sanitize

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-79, CWE-1023
Published	2026-07-14
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: sensiolabs

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 20:17 UTCPublished CVE record published
2026-07-21 19:17 UTCUpdated Record last modified

sensiolabs symfony UPGRADE

Affected: >= 6.1.0 and < 6.4.41 · >= 7.0.0 and < 7.4.13 · >= 8.0.0 and < 8.0.13

Fixed in: 6.4.41, 7.4.13, 8.0.13

Safe to downgrade to: a release before 6.1.0

1. Check installed version

apt-cache policy symfony || rpm -q symfony || symfony --version

2. UPGRADE to 6.4.41 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade symfony

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade symfony

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.1.0 (Debian / Ubuntu)

apt-cache madison symfony sudo apt install symfony=<VERSION_BEFORE_6.1.0> sudo apt-mark hold symfony

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list symfony sudo dnf downgrade symfony-<VERSION_BEFORE_6.1.0> sudo dnf versionlock add symfony

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48761?

symfony: upgrade to 6.4.41, 7.4.13, 8.0.13. Exact commands for each OS are on this page.

Is CVE-2026-48761 being exploited?

CVE-2026-48761 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48761 affect?

CVE-2026-48761 affects symfony. Severity is medium (CVSS 6.1). 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>, <appl

How urgent is CVE-2026-48761?

Priority 28/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-45073 HIGH 7.3 UPGRADE Symfony is a PHP framework for web and console applications and a set of reusable PHP components
CVE-2026-45064 MEDIUM 6.1 UPGRADE Symfony is a PHP framework for web and console applications and a set of reusable PHP components
CVE-2026-45756 HIGH 7.5 UPGRADE Symfony is a PHP framework for web and console applications and a set of reusable PHP components
CVE-2026-45754 MEDIUM 5.3 UPGRADE Symfony is a PHP framework for web and console applications and a set of reusable PHP components
CVE-2026-48489 HIGH 7.5 UPGRADE Symfony is a PHP framework for web and console applications and a set of reusable PHP components

References

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