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CVE-2026-48903· NVD / CVE Program· CNA Joomla

Joomla! Framework - [20260519] - Inadequate content filtering within the checkAttribute filter code.

Inadequate content filtering within the checkAttribute methods leads to XSS vulnerabilities in various components.

MediumCVSS 6.9 · v4.0—No exploit No fix recorded

Noroxi analysis

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Published
May 26, 2026
Updated
Jul 24, 2026
EPSS
0.2% · 14th percentile
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Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Joomla
6.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
joomlajoomla\!

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • joomla joomla!3.0.0 and later · before 5.4.6
  • joomla joomla!6.0.0 and later · before 6.1.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Joomla). Independent of NVD's CPE analysis and usually ahead of it.

  • Joomla! Project Joomla! Framework Filter package

    • 1.0.0-3.0.5, 4.0.0-4.0.1affected

Same product

joomla: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-23752[20230201] - Core - Improper access check in webservice endpointsKEV
    81Now
  • CVE-2017-8917SQL injection vulnerability in Joomla! 3.7.x before 3.7.1 allows attackers to execute arbitrary SQL commands via unspecified vectors.
    69This week
  • CVE-2016-8869The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4 allows remote
    68This week
  • CVE-2015-7297SQL injection vulnerability in Joomla! 3.2 before 3.4.4 allows remote attackers to execute arbitrary SQL commands via unspecified vectors, a
    60This week
  • CVE-2015-8562Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via t
    59Plan
  • CVE-2015-7857SQL injection vulnerability in the getListQuery function in administrator/components/com_contenthistory/models/history.php in Joomla! 3.2 be
    58Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-40748504 days apart[20250102] - Core - XSS vector in the id attribute of menu lists
    30Monitor
  • CVE-2026-259000 days apartJoomla! Core - [20260501] - XSS in feed modules
    27Monitor
  • CVE-2026-259010 days apartJoomla! Core - [20260502] - XSS in com_associations
    27Monitor
  • CVE-2026-308940 days apartJoomla! Core - [20260503] - XSS in com_contenthistory
    27Monitor
  • CVE-2026-308950 days apartJoomla! Core - [20260504] - XSS in readmore links
    27Monitor
  • CVE-2026-489050 days apartJoomla! Framework - [20260520] - Inadequate content filtering within the cleanAttributes filter code.
    27Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
P
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/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

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records