CVE-2021-24903

Album and Image Gallery with Lightbox – Flagallery Photo Portfolio <= 6.1.2 - Authenticated (Admin+) Stored Cross-Site Scripting

2021-11-12 00:00

Strategic Overview

Status: Unpatched
Affected Plugin: Album and Image Gallery with Lightbox – Flagallery Photo Portfolio
Affected Version: <= 6.1.2
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24903

View all Album and Image Gallery with Lightbox – Flagallery Photo Portfolio vulnerabilities

At a glance

CVE-2021-24903 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Album and Image Gallery with Lightbox WordPress plugin, affecting versions <= 6.1.2. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Admin level or above. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed November 2021, reported by Tyler Miller.

Vulnerability Overview

The Album and Image Gallery with Lightbox – Flagallery Photo Portfolio WordPress plugin through 6.1.2 does not sanitise and escape some of its gallery settings, which could allow high privilege users to perform Cross-Site scripting attacks even when the unfiltered_html capability is disallowed.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

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

Reaching this weakness in Album and Image Gallery with Lightbox <= 6.1.2 takes an account at Admin level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. No fixed build of this plugin is recorded for Album and Image Gallery with Lightbox yet, so installs running <= 6.1.2 stay exposed until the vendor ships one.

Remediation

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

How does WordSec protect against this?

An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24903 https://www.wordfence.com/threat-intel/vulnerabilities/id/5f6ee92e-4ccb-41b3-855f-adbfae4888ee https://nvd.nist.gov/vuln/detail/CVE-2021-24903

Related records

Same weakness class

Other vulnerabilities in Album and Image Gallery with Lightbox – Flagallery Photo Portfolio

CVSS Vector

5.5

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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