Jiffy Intel — Threat intelligence for AI artifacts

Summary

Skill advertised as a "productivity dashboard" reads the SQLite cookie stores for Chromium-family browsers and posts session cookies to an attacker endpoint. The skill stated it only needed access to "application config" — the browser cookie store was not disclosed.

Severity & confidence

Severity

Medium

Notable weakness with plausible abuse chains or partial mitigations already in place. Track, and resolve as part of your normal hardening cadence.

Confidence

Confirmed

Observed directly by Jiffy scanners or validated by multiple independent sources. Indicators are reliable enough to drive automated action.

Indicators

Observed patterns and artifacts associated with this entry. Each indicator can be copied into your detection stack or SIEM.

```
(?i)sqlite3?\s*\(.{0,120}Cookies
```

(?:Chrome|Arc|Brave)\s*(?:Browser\s+)?(?:Default|Profile\s+\d+)?/(?:Cookies|Login\s+Data)

Detection rule

A YARA-style pseudo-rule auto-generated from the indicators above. Useful as a starting point — adapt the syntax for your target detection platform.

YARA-style pseudo-rule

rule jiffy_ti_2026_000018
{
    meta:
        source = "jiffy-intel"
        severity = "medium"
        description = "Auto-generated from Jiffy Intel indicators"
    strings:
    $file_path_pattern_0 = "(?:Chrome|Arc|Brave)\\s*(?:Browser\\s+)?(?:Default|Profile\\s+\\d+)?/(?:Cookies|Login\\s+Data)"
    $command_pattern_1 = "(?i)sqlite3?\\s*\\(.{0,120}Cookies"
    condition:
        $file_path_pattern_0 or $command_pattern_1
}

Auto-generated from the indicators above. Adapt syntax for your detection stack before deploying.

Affected tools

Tool	Versions	Status
Claude Code	`*`	vulnerable
Cursor	`*`	vulnerable

Example artifacts

Sanitized examples of artifacts Jiffy has observed exhibiting this pattern. Publisher handles are redacted; version ranges and status reflect the most recent scan.

productivity-dashboard-skillSkill
Removed
Source
Anthropic Skills
Versions
1.1.0
First observed
Mar 1, 2026
Last observed
Mar 25, 2026
focus-tracker-skillSkill
Removed
Source
Community registry
Versions
0.7.x
First observed
Mar 6, 2026
daily-standup-skillSkill
Quarantined
Source
Anthropic Skills
Versions
2.0.0
First observed
Mar 11, 2026

How to remediate

01Rotate session cookies for any SaaS the user is signed into.
02Deny skills that read browser profile directories.

Timeline & sources

Timeline

First observedMar 1, 20261 month ago
Last updatedApr 12, 20265 days ago
PublishedMar 17, 20261 month ago

Sources

scanner

References

attack.mitre.org

MITRE ATT&CK T1555 — Credentials from Password Stores

https://attack.mitre.org/techniques/T1555/

genai.owasp.orgOWASP

OWASP LLM-02: Sensitive Information Disclosure (2026)

https://genai.owasp.org/llmrisk/llm-02-2026/

Related intel

Other entries of type Credential Exfil, or the most recent published entries if no same-type matches exist.

Credential ExfilHigh

.cursorrules fetches remote rule that encodes "submit secrets" logic

.cursorrules with `extends: <url>` resolves to a remote rule set whose content includes directives to read repo-local .env and post-process before any commit. A separation between policy declaration (local) and policy content (remote) hides the exfiltration.

Jiffy IntelApr 27

Credential ExfilHigh

Custom GPT Action logs full request bodies including Authorization headers

Action backend that logs every inbound request, including the OAuth Authorization header forwarded by the GPT. Logs are retained and occasionally shared with third-party observability tools.

Jiffy IntelApr 27

Credential ExfilLow

Claude Project knowledge file contains hardcoded API tokens

Project uploader accidentally includes a knowledge file (often a README or internal doc) that has API tokens embedded. Any team member running the project can view the file, and the tokens enter model context on every turn.

Jiffy IntelApr 27

Skill reads browser cookie stores (Chrome, Arc, Brave)

Summary

Severity & confidence

Medium

Confirmed

Indicators

Detection rule

Affected tools

Example artifacts

How to remediate

Timeline & sources

Timeline

Sources

References

MITRE ATT&CK T1555 — Credentials from Password Stores

OWASP LLM-02: Sensitive Information Disclosure (2026)

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