LiveActive security incident?Get immediate response
CVE Record

CVE-2019-13948: SyGuestBook A5 Version 1.2 allows stored XSS because the isValidData function in include/functions.php does...

SyGuestBook A5 Version 1.2 allows stored XSS because the isValidData function in include/functions.php does not properly block XSS payloads, as demonstrated by a crafted use of the onerror attribute of an IMG element.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2019-13948 is a stored cross-site scripting issue in SyGuestBook A5 Version 1.2. An attacker who can submit guestbook content may cause script to run later in another user's browser. Business risk depends on whether the guestbook is public-facing and whether administrators view submitted entries while authenticated.

Executive priority

Medium priority unless the guestbook is internet-facing or administrators review entries while logged in. There is no confirmed active exploitation in the provided evidence, but stored XSS can support account compromise or content tampering in exposed deployments.

Technical view

The CVE states that include/functions.php has an isValidData validation weakness that does not properly block XSS content. The issue is stored XSS, meaning malicious content can be saved and executed when rendered by the application. The provided sources do not include CVSS scoring, CWE mapping, or a vendor-fixed version.

Likely exposure

Exposure is likely limited to sites still running SyGuestBook A5 Version 1.2, especially public guestbook deployments accepting untrusted submissions. The source bundle does not provide CPEs, package identifiers, or broader affected-version data.

Exploitation context

The CVE record describes a demonstrated stored XSS technique. CISA KEV status is false in the bundle, and no cited source states active exploitation in the wild. Treat exploit status as unconfirmed public disclosure, not confirmed active abuse.

Researcher notes

The public record is sparse: no CVSS vector, no CWE, no fixed release, and affected metadata is incomplete. Analysis should center on confirming the product/version, reviewing the isValidData and rendering paths, and validating whether stored user content reaches browsers without safe encoding.

Mitigation direction

  • Check vendor or project guidance for a maintained fixed release.
  • Disable or moderate public guestbook submissions until remediated.
  • Ensure stored guestbook output is context-encoded before rendering.
  • Use a maintained sanitization library for any allowed HTML.
  • Restrict administrator review of untrusted entries to hardened sessions.

Validation and detection

  • Inventory sites for SyGuestBook A5 Version 1.2 deployments.
  • Confirm whether guestbook submissions are publicly writable.
  • Review stored entries for unexpected HTML or script-like content.
  • Verify server-side validation is not the only XSS defense.
  • Test output encoding safely in a non-production environment.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2019-13948 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.