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MediumPublic exploit

Cross-Site Scripting in EyouCms web_ico Parameter

IdentifiersCVE-2023-2058CWE-79· Improper Neutralization of Input…

CVE-2023-2058 is a cross-site scripting vulnerability in EyouCms up to version 1.6.2. The issue affects an unknown function in the HTTP POST request handler exposed at /yxcms/index.php?r=admin/extendfield/mesedit&tabid=12&id=4. According to the provided content, manipulation of the web_ico argument is not properly sanitized or encoded, allowing attacker-controlled script content to be injected and executed in a victim’s browser. The flaw is remotely exploitable and public exploit details have been disclosed. The vulnerability is also tracked as VDB-225943.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker to execute arbitrary script in the browser context of a user who loads the affected application page or processed content. Depending on the victim’s privileges and application behavior, this can enable session theft, credential capture, unauthorized actions performed as the victim, content manipulation, and access to sensitive data exposed to the browser. The provided CVSS v3.1 vector indicates user interaction is required and scope may change.

Mitigation

If you can’t patch tonight, do this now.

If an immediate upgrade is not possible, restrict access to the affected administrative endpoint, especially from untrusted networks, and limit use to trusted authenticated administrators. Apply input filtering for the web_ico parameter, enforce output encoding at render time, and deploy a Content Security Policy to reduce script execution impact where feasible. Monitor for suspicious POST requests to /yxcms/index.php?r=admin/extendfield/mesedit&tabid=12&id=4 containing script payloads or encoded markup.

Remediation

Patch, then assume compromise.

Upgrade EyouCms to a fixed version newer than 1.6.2 if one is available from the vendor. Because the flaw is tied to improper handling of the web_ico POST parameter in the affected admin endpoint, remediation should include strict server-side validation of that parameter and context-appropriate output encoding before rendering any user-controlled value into HTML, attributes, JavaScript, or related browser-interpreted contexts. Review adjacent request handlers for similar input-handling issues.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
EyoucmsEyoucmsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2023-2058
NVD
nvd.nist.gov/vuln/detail/CVE-2023-2058
MITRE CWE · CWE-79
Improper Neutralization of Input During Web…
Third Party Advisory
github.com/sleepyvv/vul_report/blob/main/EYOUCMS/XSS2.md
Third Party Advisory
vuldb.com/?ctiid.225943
Third Party Advisory
vuldb.com/?id.225943