VulnSocial

CVE-2026-27121Disclosure(svelte / svelte)

LOWCVSS 5.4 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.

svelte CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • svelte

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-02-20); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
svelte
Products
svelte

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-02-20: 1Mentions · 2026-02-21: 1Technical Details · 2026-02-20: 1Technical Details · 2026-02-21: 102-2002-21
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-27121 Cross-Site Scripting in Svelte Prior to 5.51.5 via Server-Side Re... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-27121 Vulnerability Alert Subscriptions: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=1

    Post summary

    The tweet announces CVE‑2026‑27121, noting a Cross‑Site Scripting flaw in Svelte versions before 5.51.5, but offers no evidence of PoC, exploitation, or patch information.

    0000030
    4.0K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-27121 svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using sp… https://www.cve.org/CVERecord?id=CVE-2026-27121

    Post summary

    CVE-2026-27121 exposes an XSS flaw in Svelte versions before 5.51.5 during server‑side rendering.

    0000069
    56.4K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appsveltesvelte-node.js-

Explore more

Back to dashboardsvelte CVEssvelte vulnerabilities