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Apexward Pulse
Type Vulnerability

Parser conflict

Sitecore Multiple Products Unsafe Deserialisation Vulnerability

1 sourceCVE-2025-53690

At a glance

Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal

Actively exploited in the wild — prioritise confirming exposure.

Why Medium

Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Apple Multiple Products, treat it as High.

Briefing

  • Do not treat uncorroborated claims as confirmed breaches.

Questions to ask IT

  • Do we run Apple Multiple Products, and which versions?
  • Is any of it reachable from the internet?
  • Have we checked whether it has already been used against us?
  • If it is not yet patched, what mitigation is in place, and will the fix be done by 11 Nov?

Next steps

  1. Confirm exposure, mitigation status and any service interruption risk.

Summary

  • Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP. NET machine keys to achieve remote code execution.
  • CVE-2025-53690 is listed in known-exploited catalogue (exploitation in the wild)
  • Authoritative catalogues report active exploitation of this vulnerability.

Why this matters in the UK

  • Known-exploited catalogue reports exploitation in the wild

Products and services involved

Pulse

Last checked 4d ago · Recheck overdue since 5 Nov 2026, 23:35 UK time · 3 quiet checks collapsed

Update
4 Nov 2026, 23:35 UK time · 4d ago

Suggested changed to 7d.

Listed on the — prioritise confirming exposure and patching.

EscalationDe-escalationCritical / liveWhat these mean
Drag to pan · Ctrl / ⌘ + scroll or pinch to zoom6 events

2 quiet checks hidden.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ConfirmedHeadline90% confidence

    Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

  • ConfirmedSummary fact75% confidence

    Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution. Affects Sitecore Multiple Products. Known ransomware campaign use: Unknown.

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2025-53690

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2025-53690 is listed in known-exploited catalogue (exploitation in the wild)