CVE-2022-25875Public exploitNetwork attack vector

XSS via unescaped object attribute coercion

Published Jul 12, 2022 · Updated Sep 17, 2024

Cross-site scripting in Svelte before 3.49.0 allows remote attackers to execute script in users' browsers through crafted SSR attributes. The SSR attribute helpers escaped only strings, so an object bypassed escaping and injected markup when its custom toString result was serialized. Exploitation requires an application to place attacker-controlled objects into SSR attributes and a user to view the rendered page; script runs in the application's origin.

CVSS severity6.1
Medium
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Svelte before 3.49.0 allows remote attackers to execute script in users' browsers through crafted SSR attributes. The SSR attribute helpers escaped only strings, so an object bypassed escaping and injected markup when its custom toString result was serialized. Exploitation requires an application to place attacker-controlled objects into SSR attributes and a user to view the rendered page; script runs in the application's origin.

The record

CVE
CVE-2022-25875
Published
Jul 12, 2022
Updated
Sep 17, 2024
Vendor
Svelte
Product
Svelte
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.49.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · Svelteversion=unspecified <3.49.0

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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